The RH Logic 400 is one of our most popular chair ranges thanks to its ergonomic features and durability. The RH Logic 400 features a high backrest and is based on 2PP, our philosophy of active sitting. The seat includes a layer of wool, which improves ventilation. The RH Logic 400 is simple to adjust and its controls are easily accessed. The angle of the backrest can be adjusted separately, while the chair maintains all of its basic settings even when you use the tilt mechanism.